Get_last_session(kdev_t dev, struct cdrom_multisession*ms_info)

This function should implement the old corresponding ioctl (). For device dev, the start of the last session of the current disc should be returned in the pointer argument ms_info. Note that routines in cdrom.c have sanitized this argument: its requested format will always be of the type CDROM_LBA (linear block addressing mode), whatever the calling software requested. But sanitization goes even further: the low-level implementation may return the requested information in CDROM_MSF format if it wishes so (setting the ms_info→addr_format field appropriately, of course) and the routines in cdrom.c will make the transform if necessary. The return value is 0 upon success.